A Unified Analysis of Elliptic Problems with Various Boundary Conditions and Their Approximation

Jérôme Droniou, Robert Eymard, Thierry Gallouët, Raphaèle Herbin

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Abstract

We design an abstract setting for the approximation in Banach spaces of operators acting in duality. A typical example are the gradient and divergence operators in Lebesgue-Sobolev spaces on a bounded domain. We apply this abstract setting to the numerical approximation of Leray-Lions type problems, which include in particular linear diffusion. The main interest of the abstract setting is to provide a unified convergence analysis that simultaneously covers (i) all usual boundary conditions, (ii) several approximation methods. The considered approximations can be conforming (that is, the approximation functions can belong to the energy space relative to the problem) or not, and include classical as well as recent numerical schemes. Convergence results and error estimates are given. We finally briefly show how the abstract setting can also be applied to some models such as flows in fractured medium, elasticity equations and diffusion equations on manifolds.

Original languageEnglish
Pages (from-to)339-368
Number of pages30
JournalCzechoslovak Mathematical Journal
Volume70
Issue number2
DOIs
Publication statusPublished - Jun 2020

Keywords

  • 47A58
  • 65J05
  • 65N99
  • elliptic problem
  • gradient discretisation method
  • Leray-Lions problem
  • various boundary conditions

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